package cn.icast.netty.c6;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.AdaptiveRecvByteBufAllocator;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.FixedLengthFrameDecoder;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;
import lombok.extern.slf4j.Slf4j;

@Slf4j
public class HelloWordServer {
   static void start(){
       NioEventLoopGroup boss=new NioEventLoopGroup();
       NioEventLoopGroup worker=new NioEventLoopGroup();
       try {


           ServerBootstrap serverBootstrap=new ServerBootstrap();
           serverBootstrap.channel(NioServerSocketChannel.class);
           //设置系统的接收缓冲区
          // serverBootstrap.option(ChannelOption.SO_RCVBUF,10);
           //调整netty的接收缓冲区(byteBuf)
           serverBootstrap.childOption(ChannelOption.RCVBUF_ALLOCATOR,new AdaptiveRecvByteBufAllocator(16,16,16));

           serverBootstrap.group(boss,worker);
           serverBootstrap.childHandler(new ChannelInitializer<SocketChannel>() {
               @Override
               protected void initChannel(SocketChannel ch) throws Exception {
                   //使用定长解码器：固定设置为10个字节，也就是每次读事件都会拿到10个字节长度的ByteBuf
                   ch.pipeline().addLast(new FixedLengthFrameDecoder(10));
                   ch.pipeline().addLast(new LoggingHandler(LogLevel.DEBUG));
               }
           });
           ChannelFuture channelFuture = serverBootstrap.bind(8080);
           channelFuture.channel().closeFuture().sync();
       } catch (InterruptedException e) {
          log.error("server error",e);
       } finally {
           boss.shutdownGracefully();
           worker.shutdownGracefully();
       }

   }

    public static void main(String[] args) {
        start();
    }
}
